Make RequestContext(instance_lock_checked) fail
Make RequestContext(instance_lock_checked) fail

The instance_lock_checked kwarg was added to RequestContext in [1], no
longer used in Nova since [2], and deprecated with a warning in [3].
This commit removes all handling of this kwarg, which will cause using
it to blow up with a TypeError in the super().__init__.

[1] I1127e31d86a061a93a64ee1eb4a4d900d8bf49b5
[2] Ic18017a16c5bffee85a43db65ff17283599a27ba
[3] Ib0b23a47c2e833073108af6700b16f8026631a83

Change-Id: Ie5f5a0ae018ce601c588a466399515159d8f58c0

mahak/nova,mahak/nova,klmitch/nova,openstack/nova,openstack/nova,rahulunair/nova,klmitch/nova,mahak/nova,openstack/nova,klmitch/nova,klmitch/nova,rahulunair/nova,rahulunair/nova